<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <!--为输入框提供选择输入列表-->
    <datalist id="list3">
        <option>xx</option>
        <option>yy</option>
        <option>zz</option>
        <option>aa</option>
    </datalist>
    <input type="text" list="list3">
</body>
</html>